WO2014092582A1 - Procédé et appareil pour le nettoyage de surfaces humides - Google Patents

Procédé et appareil pour le nettoyage de surfaces humides Download PDF

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Publication number
WO2014092582A1
WO2014092582A1 PCT/NO2013/050217 NO2013050217W WO2014092582A1 WO 2014092582 A1 WO2014092582 A1 WO 2014092582A1 NO 2013050217 W NO2013050217 W NO 2013050217W WO 2014092582 A1 WO2014092582 A1 WO 2014092582A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
abrasive agent
humidity
spraying
gaseous form
Prior art date
Application number
PCT/NO2013/050217
Other languages
English (en)
Inventor
Hendrik Schön
Original Assignee
Pinovo As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pinovo As filed Critical Pinovo As
Publication of WO2014092582A1 publication Critical patent/WO2014092582A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/006—Treatment of used abrasive material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B57/00—Tank or cargo hold cleaning specially adapted for vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B57/00—Tank or cargo hold cleaning specially adapted for vessels
    • B63B57/02—Tank or cargo hold cleaning specially adapted for vessels by washing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention relates to a method and an apparatus for cleaning of wet surfaces using a dry abrasive blasting agent.
  • Dry abrasive blasting is a commonly used technique for cleaning solid surfaces, particularly ceramic or metal surfaces such as pipes, panels or walls, for example to remove paint, dirt or rust prior to painting, metallization, or welding.
  • Such techniques are typically but not limited used for outdoor metal structures, for example
  • Standard surface preparation methods using dry blast cleaning generally require a relative humidity below 85 % and a surface temperature of at least 3°C above the dew point. Frequently, such working conditions are difficult to obtain, as
  • dehumidification equipment based on compression, refrigeration, desiccation and/or a combination of methods is used for humidity control of such enclosed work areas.
  • Such preparatory work can be cumbersome, time-consuming, and expensive.
  • the dew point is defined as the temperature below which the water vapor in a volume of humid air at a constant barometric pressure will condense into liquid water. Condensed water is called dew when it forms on a solid surface.
  • the dew point is a water-to-air saturation temperature.
  • the dew point is associated with relative humidity.
  • a high relative humidity indicates that the dew point is closer to the current air temperature.
  • Relative humidity of 100% indicates the dew point is equal to the current temperature and that the air is maximally saturated with water.
  • the presented invention relates to a method and an apparatus for surface cleaning of wet surfaces of extended objects, such as pipes, tanks, panels or walls, using a dry abrasive agent.
  • surface cleaning using a dry abrasive agent is understood as surface preparation with the purpose to remove all visible oil, grease, dust, dirt, mill scale, rust, coating, oxides, corrosion products and other foreign matter.
  • silica or aluminum oxide in particle form is used as the dry abrasive agent, but other grainy materials, such as, for example, sand, are also well known in this area.
  • the impact of the dry abrasive agent on the surface results in loosening of rust, paint, other contaminating matter, and the like.
  • the particles generated in such a process will be described in the following as waste.
  • the resulting surface quality of the cleaning process should be equivalent to at least SA2 / SSPC-6, preferably SA 2 1 ⁇ 2 / SSPC-10 or higher.
  • SA 2 and SA 2 1 ⁇ 2 correspond to "thorough blast-cleaning" and "very thorough blast-cleaning” according to the international standard ISO 8501 -1 (Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 1 : Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings), which is more or less identical to the requirements set by the Society for Protective Coatings (SSPC) and/or the National Association for Corrosion Engineers (NACE) in the following standards SSPC-6 / NACE No. 3 ( « SA 2) and SSPC-10 / NACE No. 2 (« SA 2 1 ⁇ 2), respectively.
  • a wet surface is understood as a surface, particularly ceramic or metal surfaces of pipes, tanks, panels or walls, exhibiting droplets and/or a thin film of liquid, preferably water, in particular generated by but not limited to condensation from the surrounding air.
  • a completely closed or partially closed chamber is established enclosing the to be cleaned surface
  • At least one nozzle sprays a stream of an abrasive agent onto the to be cleaned surface
  • any humidity in its liquid form on to be cleaned surface is converted to its gaseous form before or during said spraying of abrasive agent
  • any existing liquid humidity is converted to its gaseous form by subjecting said closed chamber to a pressure below an ambient pressure, resulting in the reduction of the relative humidity in this chamber and the diminishing of the wetness of the initially wet surface of the object.
  • said any existing liquid humidity is converted to its gaseous form by subjecting the atmosphere in said closed chamber to an increased temperature converting liquid humidity to its gaseous form.
  • said any existing liquid humidity is converted to its gaseous form by subjecting said closed chamber both to a pressure below an ambient pressure, and to an increased temperature. This may, for instance, be performed by increasing the temperature, and by delaying the spraying of the abrasive agent compared to the application of the suction resulting in an efficient drying of the air and surface inside the chamber prior to the abrasive
  • the relative humidity in the chamber is reduced below the ambient relative humidity outside the chamber.
  • the relative humidity in the chamber is kept below 85 %.
  • the temperature during the spraying process kept higher than the dew point inside the chamber.
  • temperature within the chamber is kept at least 3°C above the dew point.
  • At least one nozzle is maneuvered manually or automatically in to varying spraying angles and/or positions to increase the area cleaned in a given period of time.
  • the gasket system allows for a given air flow rate from the outside of the chamber towards the outlet in order to control the removal of the mixture of waste and used dry abrasive agent.
  • the gasket system allows for a given air flow into the chamber from the outside of the chamber towards the outlet in order to allow for movement of the apparatus 20 along the surface of the object 10.
  • a mixture of air and a dry abrasive agent such as silica, alumina and/or sand is sprayed onto the to be cleaned surface.
  • a housing arranged to define a completely closed or partially closed chamber between the inside of the apparatus and the to be cleaned surface, at least one nozzle for spraying a stream of a dry abrasive agent onto the to be cleaned surface, and one or more outlets for connection to a suction system.
  • the apparatus comprises a pre-treatment chamber separated from the blasting chamber by separating means, preferably a separating wall.
  • said pre-treatment chamber comprises at least one means to reducing the pressure and/or rising the temperature.
  • Said means to reduce the pressure may comprise a suction system.
  • Said means to rising the temperature may comprise electrical operated heating elements in the jacket structure of the apparatus.
  • Figure 1 shows a longitudinal side section of a cleaning apparatus according to the invention, to schematically illustrate the main elements of the apparatus.
  • FIG 2 and 3 show preferred embodiments of a cleaning apparatus according to the invention.
  • FIG 1 is a longitudinal side section of a cleaning apparatus for wet surfaces with its main elements.
  • An extended object 10 comprising a wet surface 12 that is to be cleaned is shown.
  • Such extended objects may include tubular objects like pipes or beams, or flat surfaces like sheets or plates.
  • An apparatus 20 according to the invention comprises a housing or a jacket 21 comprising a hollow processing chamber 22, and is arranged to be mounted and/or clamped onto the object to isolate the to be cleaned surface thus establishing a sealed off processing chamber 22 defined by the inner wall parts of the apparatus and said surface facing the chamber.
  • the housing may be fitted onto the said wet surface 12 to define said chamber 22 between the wet surface 12 and the inner wall 24 of the apparatus 20.
  • the apparatus 20 may not contain any connectable, moveable, hinged, and/or pivotable parts in order to define a closed or partially-closed chamber 22 between the surface 12 of the object 10 and the inner wall 24 of the apparatus.
  • connectable, moveable, hinged, and/or pivotable parts in order to define a closed or partially-closed chamber 22 between the surface 12 of the object 10 and the inner wall 24 of the apparatus, especially forming an enclosure of a pipe.
  • the apparatus 20 comprises a nozzle 30 that sprays a stream of a dry abrasive agent 32 onto the surface and an outlet 40 for connection to a suction system.
  • the spray nozzle 30 is connected to a source of compressed air and to a source for the dry abrasive agent.
  • the stream 32 comprises both compressed air and a dry abrasive agent.
  • the angle between the particle stream direction and the surface to be cleaned is less than perpendicular but also more than 45°. It can be advantageous to control the suction and blasting process in a way that the spraying of the abrasive agent will be delayed compared to the application of the suction resulting in an efficient drying of the air and surface inside the chamber 22 prior to the abrasive blasting process.
  • the delay should be adjustable depending on the ambient temperature and humidity, wet surface area within the chamber 22, volume of the chamber 22, and the level of reduced pressure generated within the chamber 22.
  • the apparatus 20 also comprises a gasket system 26 that sufficiently seals against the wet surface 12 so that a pressure below ambient pressure is established in the chamber 22 once suction is supplied to the outlet 40.
  • the gasket may be a ribbon of for example a rubber or plastic material mounted on or adjacent the rim edge defining the opening into the chamber 22 of the apparatus, and makes a proper seal when a pressure below ambient pressure is established by the air being sucked out of the chamber.
  • the generation of a pressure below ambient pressure in the chamber 22 results in the reduction of the relative humidity within the chamber 22 and the reduction of the wetness of initially wet surface 12.
  • suction applied to the outlet 40 will allow for the removal of used dry abrasive agent and waste generated by the stream 32 of dry abrasive agent hitting the surface of the object 10 from the chamber.
  • the dry abrasive agent will be recovered from the removed mixture of used dry abrasive agent and waste at least partly and re-used for producing the stream 32 of dry abrasive agent.
  • the gasket system 26 adjacent and around the rim edge 28 of the jacket 21 is preferably made of rubber or plastic brushes.
  • gasket system 26 may also allow for a given air flow from the outside of the chamber towards the outlet 40 in order to control the removal of the mixture of waste and used dry abrasive agent and in order to allow for movement of the apparatus 20 along the surface of the object 10.
  • the movement of the apparatus 20 may be generated manually by one or several operators, with the help of external means, e.g. pulled or pushed, or by self- propulsion.
  • the apparatus 20 may also contain a plurality of nozzles 30 which can be
  • Figure 2 shows a preferred embodiment of the apparatus 20, which comprises in addition to the features mention above a means 50 for reducing the wetness of surface 12 to be cleaned.
  • a means 50 for reducing the wetness of surface 12 to be cleaned may choose from a variety of such means, such as but not limited to one or a plurality of air nozzles, one or a plurality of squeegees, scrapers, sponges or the like, one or a plurality of heating means, such as electric or other inductive heaters 70, and/or a combination of such means.
  • the means 50 for reducing the wetness will preferable be arranged in a way that it will treat the wet surface 12 prior to entering the chamber 20 when the apparatus 20 is moved or moves along the object 10 indicated by the direction of the arrow P in Figures 1 - 3.
  • Figure 3 shows a preferred embodiment of the apparatus 20, which comprises in addition to the features mention above a means 62 like a separating wall 62 for dividing the chamber 22 between the wet surface 12 and the inner wall 24 of the apparatus 20 into two or more chambers, wherein at least one suction chamber 60 is separated from the chamber 22 where the stream 32 of dry abrasive agent is generated, and where said suction chamber 60 is connected to an outlet 40 for connection to a suction system.
  • This will allow to generate a pressure below ambient pressure at the least in the suction chamber 60.
  • the reduced pressure in the suction chamber 60 and the chamber 22 may be generated via the same outlet(s) 40 or by separate outlets 40.
  • the apparatus 20 will be moved or moves along the object in such a way that the suction chamber 60 will pre-treat the surface prior to entering chamber 22.
  • the apparatus is moved in the direction of the arrow P so that the wet and polluted surface 12 is subjected to the lower pressure chamber 60 first, and then the treatment chamber 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning In General (AREA)

Abstract

L'invention concerne un procédé pour le nettoyage de surfaces humides d'objets à l'aide d'un agent abrasif qui est caractérisé par les caractéristiques suivantes : - une chambre complètement ou partiellement fermée est établie qui renferme la surface à nettoyer, - au moins une buse qui pulvérise un flux d'un agent abrasif sur la surface à nettoyer, - toute humidité dans sa forme liquide sur la surface à nettoyer qui est convertie dans sa forme gazeuse avant ou pendant ladite pulvérisation d'agent abrasif, et le mélange d'agent abrasif utilisé et de déchets générés qui est éliminé via une ou plusieurs sorties par aspiration. L'invention concerne également un appareil permettant la mise en œuvre du procédé.
PCT/NO2013/050217 2012-12-14 2013-12-11 Procédé et appareil pour le nettoyage de surfaces humides WO2014092582A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20121514A NO336757B1 (no) 2012-12-14 2012-12-14 Fremgangsmåte og apparat for rengjøring av våte overflater
NO20121514 2012-12-14

Publications (1)

Publication Number Publication Date
WO2014092582A1 true WO2014092582A1 (fr) 2014-06-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2013/050217 WO2014092582A1 (fr) 2012-12-14 2013-12-11 Procédé et appareil pour le nettoyage de surfaces humides

Country Status (2)

Country Link
NO (1) NO336757B1 (fr)
WO (1) WO2014092582A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104722533A (zh) * 2015-01-16 2015-06-24 禹伟 一种用于流水线工作台的自动气喷装置
WO2016198419A1 (fr) * 2015-06-09 2016-12-15 Pinovo As Système de confinement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314521A (en) * 1976-11-04 1982-02-09 Trelleborg Marin Aktiebolag Method and apparatus in the treatment of underwater surfaces of fixed or floating constructions
US5628271A (en) * 1995-03-22 1997-05-13 Amclean, Inc. Apparatus and method for removing coatings from the hulls of vessels using ultra-high pressure water
US6273154B1 (en) * 1998-01-22 2001-08-14 Horst Laug Suction-removal apparatus for sand-blasting and liquid pressure nozzles
US6390898B1 (en) * 1997-10-19 2002-05-21 Gerard Pieper Method and device for treating, especially cleaning, abrasive clearing or stripping of coatings, graffiti or other superficial soiling on parts, work pieces or surfaces
US20030116649A1 (en) * 2000-04-05 2003-06-26 Peter Nielsen Apparatus for surface treatment and use of the apparatus
FR2949723A1 (fr) * 2009-09-09 2011-03-11 Bioboat Unite de decapage a sec des coques de bateaux

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314521A (en) * 1976-11-04 1982-02-09 Trelleborg Marin Aktiebolag Method and apparatus in the treatment of underwater surfaces of fixed or floating constructions
US5628271A (en) * 1995-03-22 1997-05-13 Amclean, Inc. Apparatus and method for removing coatings from the hulls of vessels using ultra-high pressure water
US6390898B1 (en) * 1997-10-19 2002-05-21 Gerard Pieper Method and device for treating, especially cleaning, abrasive clearing or stripping of coatings, graffiti or other superficial soiling on parts, work pieces or surfaces
US6273154B1 (en) * 1998-01-22 2001-08-14 Horst Laug Suction-removal apparatus for sand-blasting and liquid pressure nozzles
US20030116649A1 (en) * 2000-04-05 2003-06-26 Peter Nielsen Apparatus for surface treatment and use of the apparatus
FR2949723A1 (fr) * 2009-09-09 2011-03-11 Bioboat Unite de decapage a sec des coques de bateaux

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104722533A (zh) * 2015-01-16 2015-06-24 禹伟 一种用于流水线工作台的自动气喷装置
WO2016198419A1 (fr) * 2015-06-09 2016-12-15 Pinovo As Système de confinement

Also Published As

Publication number Publication date
NO336757B1 (no) 2015-10-26
NO20121514A1 (no) 2014-06-16

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